Yeah but it's £12.50 EVERY. SINGLE. DAY they use the car inside the zone. Even if you only drive a few times a week in it, that's another £125 odd a month in a country where everything else is going up. For those that used their cars daily in affected cars it's about £275 a month to continue doing so just for week days.
I'm talking about customers being put off taking their car to a particular business for an infrequent, potentially even one off, provision of a service.
Sure, a few of the customers who live locally might get rid of their cars and you'll be relying on a bit more business from further afield but when it comes to tuning cars, I think it's reasonably common that people will travel a bit to get to a preferred specialist. A £12.50 charge for someone to be bringing their car to you shouldn't be enough to kill off your business unless it's teetering on the edge of viability in the first place.